"To be fair there are lots of pilots who have flown multiple aircraft at an expert level that complain about the Airbus A380 - in the same ways - as well! They might not be expert airplane designers, but they have a breadth of experience, and even some of them have created their own model airplanes too."

Yes, non-experts can have valid criticisms but more often than not they're too ignorant to even understand what trade-offs are involved.